I would probably say Geoff John's worst book/idea was when he was at Marvel.

John's infamous Avengers Vol.3 issue 71 from 2003.

Where to start with that crazy issue!

The weird sex scene between Hank Pym and Wasp.

Supervillain Whirlwind having prostitutes dress up as Wasp before murdering her (which is one hell of a escalation for the villains wasp infatuation).

Later in the issue he tries to rape an unconscious Wasp, makes a crack about wanting her honey and gets chased by a giant naked Hank Pym.

The entire issue was really weird. Felt like something from the Ultimate comics rather than the Avengers.